The BlueMSX doesn't have any control mapping for keyboard, only for joypads. It expects a keyboard for keyboard input. The FMSX core has some extra options when mapping the controls and setting the Device Type to Emulated Keyboard, but it still doesn't cover the full keyboard (only a few F keys, Esc, Space, the direction arrows and Space).

@robertybob I had been toying with the idea of adding an extra system menu with the games you last played on RetroPie as a whole, as I myself had a similar need.

I'm not sure how feasible that would be, but it's certainly something I would love to have. Would that help with this use case? Visitors would probably mostly be interested in games played in that session, I assume - even though the list would span more games, probably the last 50-100?

Thanks for adding me here!

Edit: alternatively, if it's a numbering thing we'd be looking for, I'd likely suggest a script and doing that via gamelist name editing.

Edit 2: yeah, there is also a sorting option per system that can do the trick in the interim!